diff --git a/rust/Earthfile b/rust/Earthfile
index 7fee9df..f370cda 100644
--- a/rust/Earthfile
+++ b/rust/Earthfile
@@ -72,16 +72,16 @@ CARGO:
 # Notice that in order to run this function, +INIT must be called first. This function exports the target cache mount ID under the env entry: $TARGET_CACHE_ID.
 # Arguments:
 #   - command (required): Command to run, can be any expression.
-#   - cargo_home_cache_id: ID of the cargo home cache mount. By default: $CARGO_HOME_CACHE_ID as exported by +INIT
-#   - target_cache_id: ID of the target cache mount. By default: ${CARGO_HOME_CACHE_ID}#${EARTHLY_TARGET_NAME}
+#   - EARTHLY_CARGO_HOME_CACHE_ID: ID of the cargo home cache mount. By default: $EARTHLY_CARGO_HOME_CACHE_ID as exported by +INIT
+#   - target_cache_id: ID of the target cache mount. By default: ${EARTHLY_CARGO_HOME_CACHE_ID}#${EARTHLY_TARGET_NAME}
 #
 RUN_WITH_CACHE:
     COMMAND
     DO +CHECK_INITED
     ARG --required command
     ARG EARTHLY_TARGET_NAME
-    ARG cargo_home_cache_id = $CARGO_HOME_CACHE_ID
-    ARG target_cache_id="${CARGO_HOME_CACHE_ID}#${EARTHLY_TARGET_NAME}"
+    ARG cargo_home_cache_id = $EARTHLY_CARGO_HOME_CACHE_ID
+    ARG target_cache_id="${EARTHLY_CARGO_HOME_CACHE_ID}#${EARTHLY_TARGET_NAME}"
     # Save to restore at the end.
     ARG ORIGINAL_CARGO_HOME=$CARGO_HOME
     ARG ORIGINAL_CARGO_INSTALL_ROOT=$CARGO_INSTALL_ROOT